The area of a theatre, opera house or concert hall which conventionally lies behind or to the sides of the stage, to which the audience is not admitted. Therefore also any element of a performance which is hidden from the audience, or that only properly exists in the back-stage areas. As in ΓÇ£back-stage workersΓÇ¥ or ΓÇ£back-stage scandalΓÇ¥.